interface Radio {
    switchRadio(trigger: boolean):void;
}
interface Battery{
    checkBatteryStatus():void;
}

interface RadioWithBattery extends Radio {
    checkBatteryStatus():void;
}

class Car implements Radio{
    switchRadio(trigger: boolean){

    }
}

class Cellphone implements RadioWithBattery{
    switchRadio(trigger: boolean){

    }
    checkBatteryStatus(){

    }
}